Air cooler for firearms



June 6, 1933. R VQN [.rRQMMER 1,913,254

AIAB. COOLER FOR FIREARMS Filed April 2, 1952 Patented June 6, 1933 RUDOLF VON FROMMER, OF BUDAPEST, HUNGARY' AIR. COOLER Fon 'FIREARMsr Application med April 2, 1932, serial No. 602,769, and in Hungaryjfipriiz, l1931.

This'invention relates to a cooling device for tire arms which in contradistinction to the known arrangements cooling the upper part of the barrel, cools the lower part of the barrel which is hidden in the gunstock. In

tire arms the barrel of which moves in a guiding tube, only the lower part of the latter hidden in the gunstock has the cooling holes for the cooling of the barrel. In such constructions the gunstock, which extends at military guns to the front end of the barrel, is provided on its lower part with cooling openings, through which the cooling air passes by way of the perforated guiding tube to the barrel.

To protect these cooling openings against the penetration of dust, dirt, rain, snow, etc., when the lire arm is not used and so a cooling of the barrel is unnecessary, a sliding cover is provided on the lower part of the gunstock, which covers kand uncovers the cooling openings of the gunstock. In order that this cover should always remain within the length of the fire arm and that the pierced parts of the gun, that is to say the gunstock,

the guiding tube and the cover should not be considerably weakened, I provide on the gunstock instead of one continuous opening several openings, soV that for instance by pushing` foreward the sliding cover the openings of which correspond to those of the gunstoek, all the openings are closed at once. p Thus the fire arm will be entirely closed, by

withdrawing the cover however, all the openings are uncovered for the penetration of the air.

In order that the air may cool the barrel along a relatively large surface, the arrangement set forth above may be completed by a channel situated within the gunstock and connecting the openings of the latter with one another. This channel is advantageously almost as long as the barrel itself. For the purpose of fixing the cover in its foreward or backward, that is to say in its closing or opening position, a fixing member, for instance a spring controlled'pin or a snap may be applied for fixing the cover in its extreme positions. This fixing is necessary among others for preventing an undue shifting of the cover which would be produced by the kick ofthe firearm when shooting with the same.V Y' {It is already known to perforate the guiding tube of fire arms having a movable bar- '55 Y y Y* rel in order to cool the latter, but this cooling was effected on parts not covered by thegunstock;v Contrary to Vthis the barrels' offire arms according to thev present invention'vi's cooled on the part covered Vbythe'gun vstock'. 60

By this it is; attainedfthat rain, snowla'nd impurities falling down cannot 'penetrate "ini to the interior of the fire arm, even if vthe openings are uncovered. vIn ,other words, the arrangement of Vthe cooling `openings on the lower.' part of the weapon prevents the barrel and the other component parts Vof theV Y gun from becoming wet or dirty,whicliwould cause the formation of rust and wouldhinder the right operation. A further advantage of the air cooler according to the invention is that it does not increase the weight of the fire arm. vContrary to'this, the cooling openings of a guiding tube perforated in a known manner on its upper part, vmust befcovered by alsecond tube slidable on said guiding tube, this second tube increasing considerably the weightV of the fire arm. 'IVith the constructionaccording to the invention this is not the A y case, as the above mentionedV perforated sliding cover is formed by a narrow and thin metal strip which is `considerably lighter than the known covering tubefand even the weight of this metall stripis compensated by the decrease in weight caused by therop'en- 35 ings in the gun stock. p A further disadvantage of the known constructions is that the moisturey penetrating betweenthe perforated guiding tube and the covering' tube situated on'the former, may cause the' formation of rust and thus the conf glutination of these two parts which renders this known cooler useless. The avoiding'of this drawback isa further advantage of the invention. y f f 95 The accompanying' drawing shows "one form of a re arm fitted with a cooler according tothe invention.

Fig. l is a side view of the front partof the firearm showing the guiding tube, the

gunstock and the cover in section, while the barrel is shown in side elevation. The cover is shown in its rear position.

Fig. 2 is a cross section taken on line I-II of Fig. l.

Fig. 3 shows the same part of the fire arm as F ig. l but looking from below.

The barrel l is slidable in the guiding tube 1 2 provided on its lower part with openings 3. The lower part of the gunstock is "also provided with openings or holes 5 situated` under the barrel l. For covering these openings 5 a cover 7 having openings 8 is slidably mounted in a guide 6 of the gun stock,

l5 said cover uncovering the openings 5 of the gun stock when being in its opening position shown in Figs. 1 and 3. Thus the air can freely streani through the holes 5 of the gun stock and openings 3 of the guiding tube 2Q to the barrel l cooling the same effectively.

The openings 8 of the cover 7 correspond advantageously to the openings 5 of the gun stock and the full parts extending between two` holes are as long as the holes or longer than the holes, so that when shifting forwardly the cover 7' the openings of the gun stock are closed. Y

The cover 7 can be fixed by a spring con-i trolled pin 9 adapted to snap into depressions 10 or l1 of the cover 7 if the same occupies its opening or closing position.

The full parts of the gun stock situated between the holes 5 do not extend to the guiding tube 2 (see Fig. l) but leave intervening spaces 12 above themselves, enabling the cooling air to stream to the guiding tube. These spaces l2 form the already mentioned channel connecting the holes 5 with one another.

4.0 I claim:

l. In a fire arm having a barrel and a gun stock, the gun stock having a channel in its lower part, the lower part of the barrel lying freely in the said channel and being directly exposed to the cooling air of the said channel, the gun stock having apertures in its lower wall communicating with the said channel, and a cover slidable on the gun stock to open or close the said apertures.

2. In a fire arm having a slidable barrel, a guiding tube for said barrel and a gun stock, the gun stock having a channel in its lower part, said guiding tube having apertures in its lower wall'and concealed in the gun stock, the lower part of the guiding tube lying freely in the channel, the gun stock having apertures in its lower side communicating with the channel, and a cover slidable on thegun stock to open or close the said apertures. Y

In testimony whereof I ailix mv signature.

RUDOLF voN FRGMMER. 

